Non-scalding shower-bath cock.



D. W. MGNEIL.

NQN-SGALDING SHOWER BATH COCK.

APPLICATION FILED AUG..4, 1908.

Patented Dec. 7', 1909.-

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DANIEL W. IVICNEII, OIEl CINCINNATI, OHIO, ASSIGNOR TO THE JOHN DOUGLASCOM IANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

NON-SCALDING SHOWER-BATH COCK.

Specification of Letters Patent.

Patented Dec. 7, 1909.

Application led August 14, 1908. Serial No. 448,464.

.j a citizen of thel United States of America,

and resident oit Cincinnati, county of Hamilton, State of Ohio, haveinvented certain new 'and useful Improvements in Xon- ScaldingShower-Bath Cocks, of which the following is a specification.

My invention relates to shower bath cocks which regulate the flow of hotand cold water to the shower by means of the movement of one handle.

My invention is especially adapted forA use in a system of baths whereinthere are a series of adjacent showers. Heretofore there have been inuse cocks for regulating the flow of cold,l medium or hot water from theshower, by means of the. movement of a single-handle, which, in itsinitial movement would open the cold water, upon the further movementwould admit hot water to be mixed with the cold, and upon a 'stillfurther movement would increase the proportion ot" the hot water incomparison with that of the c'old. But, in these cocks heretofore used,should one bather have turned the handle to an `extent such as tocauseva iow of warm water, and a person in the adjacent shower should suddenlyturn on the cold water, this sudden demand upon the cold water ,supplyHowing to the first shower, would reduce the supply to an extent suchthat the relative proportion of the cold to the hot water would be'sosmall, that the first bather would be scalded. The

cocks heretofore used have f been open like render the supply of waterdifficult of regu-v lation.

It is the object of my invention to provide a non-scalding shower bathicock, which will have an automatic means of stopping the flow of watershould a sudden demand be made upon the cold water supply of one'cock,and to supply a cock the parts of which are little liable to wear, andin which the operation is not. so much affected by any wearing oftheparts. This object is attained by theV means described in thespecification and illustrated in the accompanying drawings, in which,

Figure l is a sectional View of a cock embodying my invention taken uponline -w of Fig. 3. Fig. 2 is a sectional View taken upon line -y-g/ ofFig. l. Fig. 3 vis a sectional view taken upon line e-fv ofF ig. l.

Referring to the parts: The valve casing is divided by suitablepartitions into a cold water chamber,'a,a hot water chamber b, anelongated mixing chamber, c,- an exit chamber, cZ, and a pressurechamber, e. Cold water is to be led into chamber, a, by means of pipe,a', and hot water is to be led into chamber, I), by pipe, b. .The wateris to be led from the exit chamber, aZ, to the showers by means of apipe, d".

Between the cold water chamber, a, and the mixing chamber, c, is a valveseat, a2, against which a valve, A, is seated. Betweenthe hot waterchamber, Z), and the mixing chamber, c, is a' valve seat, b2, againstwhich valve, B, is seated. Between the exit chamber, (Z, and the mixingchamber, c, a valve seat is formed by means of a ring, d2, with the'internal bore of which piston valve,D,hasasliding but watertightcontact. Between the exit chamber', (Z, and compression chamber, c, avalve seat c, is formed, against which a disk, (Z3, seats. Disk, (Z3, isformed integral with the valve stem (Z4, ofthe piston valve, D. Thevalve stem, (Z4, has secured upon it a cup, (Z5, which contacts thewalls of the compression chamber, c, which is connected by means of abranch pipe, e2, with the cold water pipe, a, the entrance ot' the pipe,ci', being between the end wall of the chamber, e, and thev cup, (Z5.The pipes, a, and b, have valve seats formed in their .ends againstwhich check valves, a3, and b,

are seated.

The means of moving the valves are as follows: The valve casing, F, hasa bonnet, F, secured Vupon it, the internal screwthreads of which, areengaged by the screwthreads of alcollar, g, formed integral with themain valve stem, G, to which the handwheel, G', is secured. Valve stem,G, stands in alinement with the piston valve, D, which is held incontact with the valve stem, G, by t-he pressure of the water in thechamber, e. Valve'stem, G, has adjacent t-o the collar,-g,'screwthreads, g', whose pitchy is greater than that ofthe pitch ofthe screwthreads, g, being made preferably twice the pitch. Within theelongated mixing chamber, c, is a yoke, H, whose ends havescrewt-hreaded recesses, to receive screws, at'and b4,.to which thestems, a5' and b5 of the valves, A- and B, are secured respectively.

Stem, as, has adjacent to the valve, A, a re duced portion, a7, of adiameter less than the diameter of the valve seat, q2, and adjacent tothe yoke, a collar, a8, of 'a diameter greater than the valve seat, a2.The stem` of valve, B,'has a portion, 67, adjacent to the valve of adiameter equal to the diameter of A and' B, respectively.

munication between the mixing chamber, 0

chamber,

The operation is as follows: Y In F ig. l the cock is shown in itsclosed position, viz. the stem, G, occupies a position such that thedisk, D, closes the opening between the mixing chamber, c, and the exitchamber, d, and

' the valves, A and B, are both seated. When the handle, G', is rotatedto the left, it carries the valve stem, G, in a direction away fromvalve seat, d2. The pressure of water in the chamber, c, causes thevalve, D, to follow the valve stem, G, so that the disk, D, passesbeyond the valve seat, d2, and opens the comand`the exit chamber, d. Therotation of the valve stem, G, causes the yoke, H, to move downward uponthe valve stem, G, a

'35 `distance twice that of the movement of the 'valve stem outward fromthe valve seat, d2.

The result is that the valves, A and B, are

moved inward away romthe valve seats,

a2 and b2. The movement of the valve, A, brin 's the reduced portion,a7, of the stem within the opening of the valveseat, so that cold waterflows from the chamber, a, into the mixing chamber and thence into ther,exit The enlargement, 127, of the stem of the Ahot water valve, lls theopening in the valve seat, b2, and prevents the ,passage of hot waterinto the mixing chamberf. Upon a further rotation of the hand-wheel, G,in the same direction, the tapered part of the valve stem, 67, will comeadjacent to the valve seat, b2, so that hot water will then pass 'intothe mixing chamber to be admixedwith the cold water. A further rotationof the hand-wheel, G', will draw the tapered part, as ofv the valvestem, a5, toward the valve seat, a", thus diminishing the cold watersupply, whilethe reduced portion, b5, of the hot water valve stem standswithin the valve of hot to cold water. When the rotation of f the valvestem has brought the enlargement,

as, to seat against the valve-seat, a2, it isv -sion chamber, e, and thepressure in the Vmixing and exit chambers will then carry the 4valvedisk, D, to its seat, d2, closing vthe communication between the mixingchamber and the exit chamber and cuttingmfi' the discharge of theshower, so that abather could not be scalded.

The function of the check valve, a3, is to prevent thewater from themixing chamber flowing into the cold water chamber, a, and thence intothe compression chamber, e, when a reduction of pressure in the lastnamed chamber occurs.

Whatl I claim is:

1. In a hot and cold water cock, the combination of a valve casinghaving a mixing chamber and an exit chamber communicating with themixing chamber, cold and hot water valves adapted to regulate the ow ofwater to the mixing chamber, a third valve for controlling Vthecommunication between the exit and the mixing chambers, and a means ofcommunicating the pressure of the lcold water to the third valve tocarry it away from its seat, whereby when the pressure of the Coldwaterto thev cock is dimin- .water valves in the casing and adapted toregulate the communication between the hot and cold water chambers andthe mixing chamber, a third valve adapted to regulate the communicationbetween the mixing and the exit chambers, a yoke, means of coupling thehot and cold water valves to the yoke, a valve stem having two sets ofdifferential screw-threads, one engaging the casing, -the other setengaging the yoke, and means of communicating the movement of the stemto the third valve to carry it toward its seat, whereby the movementl'ofthe valve stem regulates the positions ofthe-hot and cold water valvesand the third valve.

3. In a hot and cold water cock' the combination of a casing havingwithinit an elongated mixing chamber, a hot, water chamber, a cold waterchamberand an exlt chamber upon the same side of the mixing chamber, thewall between said chambers having openings in it, a hot water, a coldwater and an exit valve seated against the respective openings, a mainactuating stem and a n'ieans of connecting it With the valves wherebythe movement of the stem simn1 tnneously moves the three Said valves.

4. In a hot and cold Water cock the lcombination of :L casing havingWithin it an elongated mixing chamber, a hot Water chamber, a cold Waterchamber and an exit chamber. upon the Same side of the mixing chamber,the Wall between Said chambers 10 having openings in it, a hot Water, acold Water and an exit valve seated against the respective openings, uyoke, means of connecting it to the hot and cold Water valves, adifferential screw engaging' the casing and the yoke, and means ofcausing the exit 15 valve to move with the screw.

' DANIEL WV. MGNEIL.

Witnesses:

WTALTER F. MURRAY, AGNES MCCORMACK.

